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  • 1
    Electronic Resource
    Electronic Resource
    Preparation of Pure Blue–Green Algae (1966)
    [s.l.] : Nature Publishing Group
    Nature 211 (1966), S. 310-310 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Filamentous algae were grown in 10 ml. of supernatant Chu3 medium in 20-ml. loosely capped vials so that the sides and bottom of the vial were covered with a thin filamentous mat. Unicellular algae were inoculated into similar media to form lightly coloured suspensions. Irradiation was provided by ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/211310a0
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  • 2
    Electronic Resource
    Electronic Resource
    The growth and structure of short period (001) Hg1−xCdxTe-HgTe superlattices (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 2486-2493 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Molecular beam epitaxially grown short period (001) Hg1−xCdxTe-HgTe superlattices have been systematically investigated. Several narrow well widths were chosen, e.g., 30, 35 and 40 A(ring), and the barrier widths were varied between 24 and 90 A(ring) for a particular well width. Both the well width and the total period were determined directly by means of x-ray diffraction. The well width was determined by exploiting the high reflectivity from HgTe and the low reflectivity from CdTe for the (002) Bragg reflection. Knowing the well and barrier widths we have been able to set an upper limit on the average Cd concentration of the barriers, x¯b, by annealing several superlattices and then measuring the composition of the resulting alloy. x¯b was shown to decrease exponentially with decreasing barrier width. The structure of a very short period superlattice, i.e., 31.4 A(ring), was also investigated by transmission electron microscopy, corroborating the x-ray diffraction results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354687
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  • 3
    Electronic Resource
    Electronic Resource
    A new model for the absorption coefficient of narrow-gap (Hg,Cd)Te that simultaneously considers band tails and band filling (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 3486-3492 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A semiempirical model is presented that correlates the broadening of the absorption edge with both transitions below the energy gap and with transitions by the Kane band model. This model correctly fits both the absorption and luminescence spectra of narrow-gap (Hg,Cd)Te samples that have been grown by the traveling heater method as well as by molecular-beam epitaxy. The accuracy of the band-gap determination is enhanced by this model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352954
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  • 4
    Electronic Resource
    Electronic Resource
    Comparison of band structure calculations and photoluminescence experiments on HgTe/CdTe superlattices grown by molecular beam epitaxy (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 5610-5613 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have grown HgTe/CdTe superlattices by molecular beam epitaxy; barrier thicknesses were in the range from 15 to 91 A(ring) and the well thickness was maintained at a constant value of 30 A(ring). The infrared photoluminescence was investigated by means of Fourier transform infrared spectroscopy in the temperature range from 4.2 to 300 K. All superlattices showed pronounced photoluminescence at temperatures up to 300 K. To gain more detailed insight into the band structure of the HgTe/CdTe superlattices, band structure calculations were performed. The concept of the envelope function approximation was followed. Employing the transfer matrix method, the calculations were completed taking into account an eight band k⋅p model. An important parameter in these calculations is the natural valence band offset (VBO) between the well and barrier materials. As a general trend, the value for the direct gap decreases with increasing VBO. The experimentally determined energies of the band gap are in reasonable agreement with the values obtained by the theoretical calculations. A comparison between theory and experiment shows that the observed transition energies are closer to calculations employing a large offset (350 meV) as opposed to a small VBO (40 meV).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351375
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  • 5
    Electronic Resource
    Electronic Resource
    Composition and wavelength dependence of the refractive index in Cd1−xMnxTe epitaxial layers (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 2192-2194 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have investigated Cd1−xMnxTe thin films with Mn concentrations of x=0.12, 0.18, 0.30, 0.52, and 0.70. These single crystal layers were grown by molecular beam epitaxy on [001] CdTe substrates. The real part of the refractive index, n, was determined below the band-gap E0 in the range of 0.5–2.5 eV at T=300 K. The parallel reflectivity was measured near the Brewster angle at the YAG laser wavelength of 1.064 μm (hν=1.165 eV). Combining these results with the optical pathlength results (nd) of reflection measurements in a Fourier spectrometer we have determined n(x,ν) over a wide spectral range by utilizing a three parameter fit. The accuracy of these results for n should improve waveguide designs based on this material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107076
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